CesiumGS/cesium

Zoom is slower when close to a model

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#5,131 创建于 2017年3月20日

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 (5 评论) (0 反应) (0 负责人)JavaScript (11,758 star) (3,324 fork)batch import
category - cameragood first issuetype - enhancement

描述

Reported in the forum here: http://cesiumjs.org/forum.html#!msg/cesium-dev/C_OT9kB9RV8/-zlIMRjWCAAJ

Zooming is slower when the camera is close-ish to a model. Possibly not the proximity to the model, but the fact that the model is "in the center" of the view.

http://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=a4bc90cb451cc3c997566e34a655c5ca

if you change the value of latOffsetin getPositionCentered() you will notice the difference.

贡献者指南

技术栈
javascript
领域
performance
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
Familiarity with CesiumWebGL rendering conceptsPerformance profiling tools
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
25
研究方向
Reproduce the slowdown using the Sandcastle example with latOffset parameter. Profile the rendering pipeline with browser tools to identify the bottleneck. Investigate the camera zoom logic in Cesium's source and check if the model is causing excessive draw calls or frustum calculations.